单项选择题

() is known to the world, Mark Twain is a great American writer.

A.That
B.Which
C.It
D.As

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单项选择题
Professor Black had us () compositions every Friday.

A.to write
B.written
C.write
D.wrote
单项选择题
Mrs. Brown is supposed () for Italy last week.

A.to have left
B.to be leaving
C.to leave
D.to have been left
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